A power storage and electrical generating device includes a massive flywheel with a hub mounting the flywheel for rotation about a flywheel axis. At least one motor is carried on the hub for driving the flywheel about the axis Batteries powered by an outside source such as solar cells or wind turbines provide power to the batteries and the motors. Electrical generating elements within a hollow interior of the flywheel generate electrical power for supply via slip rings at the hub for an outside component or components. The flywheel has a wing shape with two surfaces converging to a peripheral edge surrounding the flywheel. In larger designs, balancing of the flywheel may be provided by gyroscopic control.
